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Good advice above.Another thing you may try is a product like Swirl-Away. This product will clean your pipes and other places you cant see. It would be overkill to use this after 2 weeks of use, but I do see a benefit to using it a couple of times a year. Although it does say this clearly on the packaging (no one ever reads it) turn your air controls off when using Swirl-Away. If you can't turn air injection off (like in a D-1) dont use it.